Dayang Chem (Hangzhou) Co., Ltd.
China
Product Name: Chlorzoxazone
Price: $Inquiry/100g $Inquiry/1kg $Inquiry/100kg $Inquiry/1000kg
Purity: 98.0%
Stocking Period: Inquiry
Contact: Ms Wang
Email: enquiry@dycnchem.com

Henan Tianfu Chemical Co., Ltd.
China
Product Name: Chlorzoxazone API
Price: $Inquiry/1kg $Inquiry/25kg $Inquiry/1000kg $Inquiry/10ton
Purity: 99.0%
Stocking Period: Inquiry
Contact: Anson
Email: info@tianfuchem.com

95-25-0

95-25-0 structure

Name: Chlorzoxazone
Chemical Name: Chlorzoxazone
CAS Number: 95-25-0
Molecular Formula: C₇H₄ClNO₂
Molecular Weight: 169.565
Catalog: API Anesthetic Agents Skeletal muscle relaxant
Create Date: 2018-09-01 16:51:58
Modify Date: 2026-07-01 22:36:27
Chlorzoxazone is a centrally acting muscle relaxant used to treat muscle spasm and the resulting pain or discomfort. It acts on the spinal cord by depressing reflexes.Chlorzoxazone is currently being used as a marker substrate in vitro/vivo studies to quantify cytochrome P450 2E1 (CYP2E1) activity in humans.

Name	Chlorzoxazone
Synonyms	Paflex CLORZOXAZONE Chlorzoxane 5-chloro-2,3-dihydro-1,3-benzoxazol-2-one 5-CHLORO-2-BENZOXAZOLONE chloroxazone 5-chloro-2(3h)-benzoxazolon 5-CHLORO-2-HYDROXYBENZOXAZOLE 5-Chloro-3(H)-2-benzoxazolone 5-Chlorobenzoxazol-2-one 5-CHLORO-2-BENZOXAZOLINONE 5-Chloro-2-benzoxazolone (Chlorzoxazone) EINECS 202-403-9 CHLOROZOXAZONE CHLORZOXANE Biomioran 5-chloro-3H-benzooxazol-2-one 2-Hydroxy-5-chlorobenzoxazole USAF ma-10 5-Chlorobenzoxazolinone Solaxin Chloroxazone 5-Chloro-2(3H)-benzoxazolone, 5-Chloro-2-hydroxybenzoxazole Myoflexine 5-Chlorobenzoxazol-2(3H)-one 5-chloro-2-benzoxazolinon 5-Chloro-2-benzoxazolone CHLORZOXAZONE (5-CHLORO-2-BENZOXAZOLONE) 2-Benzoxazolinone, 5-chloro 5-Chloro-2-benzoxazolinoone Neoflex 5-Chloro-1,3-benzoxazol-2(3H)-one 5-CHLOROBENZOXAZOL-2-ONE T56 BMVOJ GG Chlorzoxazone /BP CHLOROXAZON component of Pafon Forte Myoflexin chlorzoxazone 5-chloro-2(3h)-benzoxazolone T56 BN DOJ CQ GG Chlorzoxazone (350 mg) 5-Chlorobenzoksazolinon-2 Paraflex 5-Chlorobenzoxazolidone Chlorzoxazone,5-Chloro-2(3H)-benzoxazolone, 5-Chloro-2-hydroxybenzoxazole Chlorzoxazone, substrate for Cytochrome P450 2E TIMTEC-BB SBB003864 CHLORZOXAZONE-D3 5-Chlorbenzoxazolin-2-on CHLORZOXAZONE SKELETAL MUSCLE RELAX Chlorzoxazone, Chlorzoxazonum Miotran 5-CHLOROBENZO[D]OXAZOL-2(3H)-ONE 5-Chlorobenzoxazolone MFCD00005717 pafonforte Escoflex Mioran CHLORZOXAZONE Chlorzoxazon usafma-10 5-Chloro-2-benzoxazolol Chlorzoxazone-13C,15N,D2 2(3H)-Benzoxazolone, 5-chloro 5-chloro-3H-1,3-benzoxazol-2-one 5-Chlor-2-hydroxy-benzoxazol 5-Chlorobenzoksazolon-2 Pafon Forte DSC 5-Chloro-2-hydroxybenzoxazole Pathorysin

Description	Chlorzoxazone is a centrally acting muscle relaxant used to treat muscle spasm and the resulting pain or discomfort. It acts on the spinal cord by depressing reflexes.Chlorzoxazone is currently being used as a marker substrate in vitro/vivo studies to quantify cytochrome P450 2E1 (CYP2E1) activity in humans.
Related Catalog	Signaling Pathways >> Metabolic Enzyme/Protease >> Cytochrome P450 Research Areas >> Inflammation/Immunology
References	[1]. Yamamura Y, et al. Comprehensive kinetic analysis and influence of reaction components for chlorzoxazone 6-hydroxylation in human liver microsomes with CYP antibodies. Xenobiotica. 2015 Apr;45(4):353-360.

Density	1.5±0.1 g/cm3
Boiling Point	336.9±34.0 °C at 760 mmHg
Melting Point	191-192 °C(lit.)
Molecular Formula	C₇H₄ClNO₂
Molecular Weight	169.565
Flash Point	157.5±25.7 °C
Exact Mass	168.993057
PSA	46.26000
LogP	2.29
Vapour Pressure	0.0±0.8 mmHg at 25°C
Index of Refraction	1.674
Water Solubility	0.1 g/100 mL

CHEMICAL IDENTIFICATION

RTECS NUMBER :: DM5250000

CHEMICAL NAME :: 2-Benzoxazolinone, 5-chloro-

CAS REGISTRY NUMBER :: 95-25-0

LAST UPDATED :: 199701

DATA ITEMS CITED :: 10

MOLECULAR FORMULA :: C7-H4-Cl-N-O2

MOLECULAR WEIGHT :: 169.57

WISWESSER LINE NOTATION :: T56 BMVOJ HG

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 763 mg/kg

TOXIC EFFECTS :: Behavioral - altered sleep time (including change in righting reflex) Behavioral - muscle weakness Behavioral - ataxia

REFERENCE :: JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 129,75,1960

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 150 mg/kg

TOXIC EFFECTS :: Behavioral - altered sleep time (including change in righting reflex) Behavioral - muscle weakness Behavioral - ataxia

REFERENCE :: JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 129,75,1960

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 440 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: ARZNAD Arzneimittel-Forschung. Drug Research. (Editio Cantor Verlag, Postfach 1255, W-7960 Aulendorf, Fed. Rep. Ger.) V.1- 1951- Volume(issue)/page/year: 17,242,1967

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 50 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: NTIS** National Technical Information Service. (Springfield, VA 22161) Formerly U.S. Clearinghouse for Scientific & Technical Information. Volume(issue)/page/year: AD277-689

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Subcutaneous

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 170 mg/kg

TOXIC EFFECTS :: Behavioral - anticonvulsant

REFERENCE :: APTOA6 Acta Pharmacologica et Toxicologica. (Copenhagen, Denmark) V.1-59, 1945-86. For publisher information, see PHTOEH Volume(issue)/page/year: 19,247,1962

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 662 mg/kg

TOXIC EFFECTS :: Behavioral - altered sleep time (including change in righting reflex) Behavioral - muscle weakness Behavioral - ataxia

REFERENCE :: JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 129,75,1960

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 166 mg/kg

TOXIC EFFECTS :: Behavioral - altered sleep time (including change in righting reflex) Behavioral - muscle weakness Behavioral - ataxia

REFERENCE :: JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 129,75,1960

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Mammal - species unspecified

DOSE/DURATION :: 550 mg/kg

TOXIC EFFECTS :: Behavioral - altered sleep time (including change in righting reflex)

REFERENCE :: CHTPBA Chimica Therapeutica. (Paris, France) V.1-8, 1965-73. For publisher information, see EJMCA5. Volume(issue)/page/year: 6,65,1971 *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - X5399 No. of Facilities: 24 (estimated) No. of Industries: 1 No. of Occupations: 1 No. of Employees: 666 (estimated) No. of Female Employees: 403 (estimated)

Symbol	GHS07
Signal Word	Warning
Hazard Statements	H302-H315-H319-H335
Precautionary Statements	P301 + P312 + P330-P305 + P351 + P338
Personal Protective Equipment	dust mask type N95 (US);Eyeshields;Gloves
Hazard Codes	Xi:Irritant
Risk Phrases	R36/37/38
Safety Phrases	S26-S36-S24/25-S37/39
RIDADR	NONH for all modes of transport
WGK Germany	3
RTECS	DM5250000
HS Code	2934999090

Precursor 0
DownStream 10
14733-75-6 17929-34-9 24963-36-8 27087-06-5
95-85-2 6358-07-2 16376-55-9 16376-61-7
22876-19-3 1750-45-4

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

The content on this webpage is sourced from various professional data sources. If you have any questions or concerns regarding the content, please feel free to contact service1@chemsrc.com.

2171961-45-6	2770451-84-6
73955-54-1	1250618-71-3
1269026-23-4	1092075-74-5
1266367-29-6	1266367-45-6
1266372-19-3	1266370-76-6